Be careful Raven, although we can't really ban car mods, we can ban you for different handling.
Example :
Downloaded Subaru WRC 4x4
Even though the server has it's own handling.cfg, your mod's shape will be different to ours, for example the gaps between each wheel. This DOES have an effect on the cars/handling.
Downloaded Honda NSX
DJ Harvey is my example, he had a modification for his Infernus, on our screens his car was bouncing and sparking which looked totally wrong. That's why mods suck.
Be careful.